I just don't get it. Maybe I'm wrong about this.
But it seems to me like giving someone your RealID so you can chat cross server/game/faction etc, is pretty much giving a hacker the biggest piece of the puzzle to gaining access to your account. You log into WoW with your RealID name, aka your email. Sounds like a great idea to give it to people, even if you "know" them over the game.
Anyone else follow this train of thought, or am I stupid?